Why are receptors on the cell surface necessary for bacterial movement?
a. The receptors actually spin the flagella.
b. The receptors sense the stimulus and send signals to the flagella.
c. The bacterium contains receptors that are sensitive to light.
d. The receptors physically alter shape to steer the bacterium.
Answer: b. The receptors sense the stimulus and send signals to the flagella.
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A stroke volume of 70 mL/cycle in a heart with a pulse of 72 cycles per minute results in a cardiac output of about _____
A) 5 liters per minute B) 50 milliliters per minute C) 0.5 liters per minute D) 50 liters per minute E) 500 liters per minute
Approximately how many genes comprise the human exome?
A) 20 million B) 200,000 C) 2,000 D) 20,000
ABO blood type demonstrates which of the following inheritance patterns? (Select all that apply.)
A) complete dominance B) incomplete dominance C) codominance D) pleiotropy E) three genes are involved
If two copies of a gene are identical alleles, the condition is referred to as
a. homozygous. b. heterozygous. c. hybrid. d. dominant. e. codominant.